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Biological activities of rabbit antibodies against synthetic human thyrotropin receptor peptides representing

S Sakata1, T Ogawa, I Matsui

  • 1Third Department of Internal Medicine, Gifu University School of Medicine, Japan.

Biochemical and Biophysical Research Communications
|February 14, 1992
PubMed

Recently, we have shown that the thyrotropin (TSH) binding regions of human thyrotropin receptor (TSHR) reside in two areas within residues 12-44 and 308-344. Serial antisera were raised against four overlapping synthetic peptides representing these two regions of TSHR (peptides 12-30, 24-44, 308-328, and 324-344) and were investigated for their ability to stimulate or block the cultured porcine thyroid cells. In addition, serum concentrations of triiodothyronine (T3) and thyroxine (T4) in serial sera obtained from each rabbit were examined. It was shown that residues of 12-30 and 324-344 of TSHR, respectively, are the site (at least a part of the site) where stimulating (TSAb) and blocking type (TSBAb) immunoglobulins are directed.

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